Boiler-pressure regulator.



l. A. BACKLUND.

BOILER PRESSURE REGULATOR. APPLICATION FILED mu :4. I915.

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ISAACALFRED BACKLUND, OF CHICAGO, ILLINOIS, ASSIGNOR TO CARRICKENGINEER- ING- CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

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Specification of Letters Patent. Patented Aug. 20, 1918.

Application filed May 24, 1915. Serial No. 29,987.

To all whom it may concern:

Be it known that I, IsAAo ALFRED BACK- LUND, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements inBoiler-Pressure Regulators, of which the following is a specification.

This invention relates to draft regulators for steam boilers and, moreparticularly, to

improvements in the apparatus illustrated in patent application Ser. No.858,923, filed by me August 27, 1914.

The object of the invention is the provision of improved devices of thischaracter for the better regulation of the steam pres,- sures Withinboilers and especially those of relatively large sizes.

The invention is illustrated in the accompanying drawings, whereinFigure 1 is a view shown partly in front elevation and partly invertical section of draft regulating apparatus applied to a steamboiler; and

ig. 2is a transverse vertical an enlarged scale of the controlling valvethereof.

Referring to said drawing, the numeral 1 designates a steam boilerhaving a smoke stack 3 which is provided with a damper, as indicated bybroken lines 4. A water column 5, so called, is connected with theboiler above and below the water level, by pipes 6 and 7, respectively.8 represents a tank which is connected by a pipe 9 with the upper end ofsaid Water column and thence by the aforesaid pipe 6 with the steamspace within the boiler.

The tank 8 is supplied with a liquid such as mercury or Water and, wherethe latter is used, it is most conveniently obtained from the watercolumn 5 through a branch 9 of pipe 9. A shut off valve 10 is providedin the water supply pipe 9 and is thereby .closed after a predeterminedamount of water is supplied to the tank and remains closed during theoperating of the apparatus. 11 is a pet cock, provided for the tank towithdraw therefrom surplus water due to the condensation of steam whichif not removed section to.

' same.

12 represents a pipe communicating with 1 the lower end ofsaid tank andis connected by a flexible tube 13 and a fitting 13 with a pipe 14rigidly secured to a liquid receptacle 15. The pipe 14 has outlets 14aflording communication With the interior of the receptacle.-

The pipe 14 is advantageously extended, as at 14 a distance above saidreceptacle and its upper end opens into the external atmosphere.Depending below the receptacle is a rod 16 which is vertically movablein guide 17. Said rod is provided with spaced apertures 16 which may beselectively used to accommodate pins, as 16 disposed above and belowsaid guide to limit the vertical movements of the receptacle 15. Securedin adjusted position to pipe part 14 is a sleeve 18 provided with a stud18 whereby it is pivotally connected to the arm of a lever whose otherarm 19 carries a counter Weight 20 adapted to over balance and elevatethe receptacle 15 when the liquid has drained therefrom.

The above described parts are substantially like those described in theaforesaid patent application, but in this instance the oiiice of thereceptacle is to regulate upon occasion the action of a controllingvalve for the admission of water into a hydraulic cylinder which isarranged to close the smoke pipe damper 4.

When the controlling valve is moved into position to allow the water toescape from the referred to cylinder, a weight connected with the damperbecomes operative to open the same. More particularly, the above framewhose lower member 25 is slidable is mounted. 34 represents a Weightcarried by the lever 32 and tends to hold the damper in open position.

35 is a pipe making connection between;

the cylinder 21 andthe casing 36 of a three- Way valve 37, which ispreferably of the rotary type. Said casing, in addition to its opening35 for the pipe 35, has two openings 38 and 39, whereof the former, 38,is

connected by pine elements 38 and 38 with a pipe 38 which, in turn, isconnected with a water supply such as a city main. The

other opening, 39, is connected by pipe ele-' ment 39 with awaste pipe39 which may lead to a sewer. r

The valve proper 37 has a cavity 37 therein which may be brought intopositions to afford communication between the container pipe 35 and theopening for either the water supply or the waste pipes. The valve 37 isprovided with a handle bar 37 which is connected by a rod 40 to thelever arm 19 supporting the receptacle 15 so that as the same descendsor ascends the valve is influenced to respectively admit or allow thewater to escape from the cylinder 21.-

11 is a valve for the pipe 9 and is employed when the apparatus is to berendered temporarily idle as, for example, when supplying liquid to thetank 8. 42 is a valve for the pipe 38 and is used when the water supplyis to be made inoperative.

43 indicates a vibratory arm for sustaining a portion ofthe weight ofthe chain 30 where the latter extends for a considerable distance. Thisarm and the lever 1919 may be supported by any suitable'means as forexample by a column 44 including vari-' ous of the aforesaid pipeelements and se-* cured most conveniently to the tank 8.

The operation of the invention is as follows: The tank 8 is firstsupplied with liquid to a predetermined height under atmosphericpressure as would obtain when the valve 41 is closed. This valve is thenopened admitting steam from the boiler into the tank where it acts toforce the liquid up through pipes 12 and 13.

Should the boiler pressure exceed that for which the apparatus isadjusted the liquid will be elevated into the receptacle 15 andultimately add sufficient weight thereto to overcome the weight 20resulting in the lowering of the receptacle with a correspondingmovement of the lever arm 19. When this occurs motion is impartedthrough the rod 40 to cause the valve 37 to be rotated from the positionin which it is indicated in Fig. 1 to that in which it is shown in Fig.2, whereupon the valve 37 is open withrespect to communication betweenthe supply pipe 38 and the cylinder 21. The pressure of the water thusadmitted to said cylinder effects the elevation of the plunger 23together with the movable frame which is secured thereto. As the framerises it acts through the medium of link 27 and lever 28-28 to exercisea pull through. the chain 30 to influence the arm 31 so as to effect aclosing movement of the damper 4. As the damper closes the fire in theboiler furnace will. be more or less checked with a lessening in thegeneration of steam until the pressure thereof has been reduced belowwhat is requisite to retain the liquid in receptacle 15. When thisoccurs the liquid returns'from said receptacle to tank'8 and thereceptacle being thus relieved elevated by the power of weight 20.

The lever arm 19 swings upwardly wit the receptacle and acts through therod 40 to restore the valve 37 into the position in which it is shown inFig. 1, thereby opening communication between the cylinder 21 and thewaste pipe 39 for the escape of Water from the cylinder. The water beingthus withdrawn renders the plunger unsupported and it descends torelieve the chain 30 and .erly adjusted it operates without anyattention by the fireman.

What I claim, is I p In apparatus of the class described, thecombination with a steam boiler, a draftregulating device therefor,means tending to maintain the latter in inoperative position, and ahydraulic motor operatively connected with said device, of meansinfluenced by an increase and decrease, respectively, of steam pressurewithin the boiler for rendering said motor operative and inoperative toactuate saiddraft-regulating device, said last-named means comprising astationary liquid containing tank communicatively connected from itsupper end with the steam space in said boiler, a vertically movableliquid receptacle having communicative connection w1th the lower end ofthe tank, adjustable means tending to yield ingly retain the receptaclein its uppermost position, a water supply pipe and a water waste pipecommunicatively connected with,

said motor, a valve for controlling the flow of Water from and to therespective pipes in relation to said motor, and connections between saidadjustable means and said valve whereby the latter is caused to be posi-"tively moved and proportionately to the movements of the receptacle dueto the flow .of liquid into or from the same due to vari ations in steampressures obtaining in said tank.

Signed at Chicago, 111., this 6th day of May, 1915.

ISAAC ALFRED BACKLUND. Witnesses:

. FRED S. FULTON,'

J. H. CROSBY.

